Charging Topology

The charging topology, as relevant to the eMSP, consists of three entities:

  • Connector is a specific socket or cable available for the EV to make use of.
  • EVSE is the part that controls the power supply to a single EV in a single session. An EVSE may provide multiple connectors but only one of these can be active at the same time.
  • Location is a group of one or more EVSEs that belong together geographically or spatially.

The Concept of the Charge Station in OCPI
In OCPI there are only Locations, EVSEs and Connectors. There is no Charge Station in the data layer.

Within OCPP and in GreenFlux system, the entity of a Charge Station or Charge Point exists. This is necessary from e.g. an Asset management and reporting perspective.

Below is an example OCPI 2.1.1. Location object.
In practice one can see that this Location could have one or two Charge station.
One EVSE that has two connectors the other EVSE has only one.

#OCPI 2.1.1
{
  "id": "LOC1",
  "type": "ON_STREET",
  "name": "Gent Zuid",
  "address": "F.Rooseveltlaan 3A",
  "city": "Gent",
  "postal_code": "9000",
  "country": "BEL",
  "coordinates": {
    "latitude": "51.04759",
    "longitude": "3.72994"
  },
  "evses": [
    {
      "uid": "3256",
      "id": "BE-BEC-E041503001",
      "status": "AVAILABLE",
      "status_schedule": [],
      "capabilities": [
        "RESERVABLE"
      ],
      "connectors": [
        {
          "id": "1",
          "standard": "IEC_62196_T2",
          "format": "CABLE",
          "power_type": "AC_3_PHASE",
          "voltage": 220,
          "amperage": 16,
          "tariff_id": "11",
          "last_updated": "2015-03-16T10:10:02Z"
        },
        {
          "id": "2",
          "standard": "IEC_62196_T2",
          "format": "SOCKET",
          "power_type": "AC_3_PHASE",
          "voltage": 220,
          "amperage": 16,
          "tariff_id": "11",
          "last_updated": "2015-03-18T08:12:01Z"
        }
      ],
      "physical_reference": "1",
      "floor_level": "-1",
      "last_updated": "2015-06-28T08:12:01Z"
    },
    {
      "uid": "3257",
      "id": "BE-BEC-E041503002",
      "status": "RESERVED",
      "capabilities": [
        "RESERVABLE"
      ],
      "connectors": [
        {
          "id": "1",
          "status": "RESERVED",
          "standard": "IEC_62196_T2",
          "format": "SOCKET",
          "power_type": "AC_3_PHASE",
          "voltage": 220,
          "amperage": 16,
          "tariff_id": "12"
        }
      ],
      "physical_reference": "2",
      "floor_level": "-2",
      "last_updated": "2015-06-29T20:39:09Z"
    }
  ],
  "operator": {
    "name": "BeCharged"
  },
  "last_updated": "2015-06-29T20:39:09Z"
}

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